Mixing bowl



FIG. 1 is a perspective view of a mixing bowl according to the design;

FIG. 2 is a front elevation view thereof, a back elevation view being identical to the front elevation view;

FIG. 3 is a left side elevation view thereof, a right side elevation view being identical to the left side elevation view;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

The portions of the article shown in broken line form no part of the claimed design. 

CLAIM The ornamental design for a mixing bowl, as shown and described. 